ASP.NET stores data on some static instances - do not persistence

JSW21
JSW21 used Ask the Experts™
on
In asp.net I store data on static list so web users can access quickly without having to queries on sql.

From time to time the static list just disappear, when that happen asp.net with queries from sql again.

I which to know what cause the static object to disappear? is it because application pool recycling?

Thx,
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Senior Software Engineer
Top Expert 2009
Commented:
Yes, your static object exist as long as IIS process that is servicing your web requests is available.
You are better off using Cache in your page, for example:
http://asp.net-tutorials.com/caching/object-caching/
http://msdn.microsoft.com/en-us/library/aa478965.aspx
http://www.dotnetperls.com/cache
Caching will NOT solve this problem. When the application pool recycles all APP Domain data gets wiped out, this includes, sessions, static objects and cache.
What you need to do is build your list in the Application_Start event. This is the only way to have the list recreated after the application pool recycle.

You can find it or create it in the event in your application's global.asxc.cs
 protected void Application_Start(object sender, EventArgs e)
{
//create your list here
}

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